CRAB LAB

an Amphibological Research Project

Introduction

Here at the ​Department of Amphibological Research​, our primary studies are in the equivocal interpretation of the natural world. While on Ko Lon, we used technologically aided misidentification techniques to discover a host of ambiguous new species on the island. However, we became especially fascinated with one particular animal: the hermit crab (Fig. 1).

Figure 1

Hermit crabs in Ko Lon are not difficult to spot: lay still on the beach for more than a couple of minutes and you will soon notice some shells crawling around you. We immediately fell in love with the little crustaceans. Maybe because, unlike most animals, they are so easy to catch and play with: delightful toy-sized robots of nature. Maybe because their mismatched shells gives each one of them a slightly goofy and unique look. Whatever the reason: we started asking ourselves some amphibological questions: is it possible that the different shells reflect different aesthetic preferences and personalities? Or ​vice versa:​ can the chosen shell affect the crab’s attitudes and behaviors? The field seemed ripe for some crab misunderstanding, but we didn’t know how to tackle these important questions.

Figure 2

Then, early on during one of our explorations – when the sand on the beach was still undisturbed by Dinosaur tracks – we noticed the intricate imprints left behind by the hermit crabs (Fig. 2). Rambling and asymmetric, they came in so many different sizes and shapes, almost as varied as their shells. We therefore speculated that the tracks may provide a window into the personality of the crabs. To test this hypothesis, three experimental protocols were designed and performed between July 8 and July 10.

Methods and Results

1. Sand – The most obvious first step was to attempt to record the crab tracks directly on the original inspirational medium: sand. However, we needed a way to record crabs behaviour in a controlled environment, one crab at the time. We proceeded to dig a more or less rectangular arena (Fig. 3A), high enough to prevent a medium sized crab to escape (which some passersby delightfully misunderstood as a crab-fighting pit). We then proceeded to place in the arena 3 separate crabs, with notably different shells, letting them free to wander around for a couple of minutes each and took pictures of their tracks (see Fig. 3B). However, this first method was not satisfying for two reasons: the most extravagant crabs emerge from their burrow toward dusk, which meant that the lighting conditions on the beach were far from ideal at the time of the experiment. Also, the crabs instead of wandering around were mostly trying to escape, slowly demolishing the walls of our arena. Soon enough we decided to fold up the Crab Lab #1.

Figure 3A
Figure 3B
Crab Lab fail

2. Paint – Although less faithful than sand tracks, paint provides a much more durable and easy medium to record the crabs crawling. We first experimented with some blue acrylic paint, to see if the crabs were comfortable with this medium. Protected by their exoskeleton the crabs didn’t seem to mind having their legs dipped in blue paint and we were extremely pleased with the results (Fig. 4A). We therefore proceeded with more elaborate experiments, completely disregarding our original plan to record each crab individually. The painting in Fig. 4B was produced by letting an indeterminate number of crabs, randomly sampled from our surroundings, wander around as long as we pleased.

 

Figure 4A
Figure 4B

We later got over our excitement and returned to our original goal: we collected 3 crabs (Fig. 5A) with distinctive shells and let each one of them paint for a couple of minutes with a different color on sheets of papers of equal size (NOTE: each crab was arbitrarily moved around at random locations whenever the crab got fixated on a corner – more often than not). Overlapping the separate channels (Fig. 5B) clearly reveals very different levels of craftsmanship and artistic sensibilities.

Crab A (blue) has a bold sensibility with rational, linear strokes. There is a sureness and sophistication to these graphic, directional lines, evoking a flowing river or receding tide.

Crab B (red)’s work takes a more tentative, thoughtful approach – its mark making has an impressionistic quality with a cross-hatched layering effect – describing dimensions of an unknowable form.

Crab C (yellow) took a more playful approach, her work recalls the graffiti like scrawls of a young Cy Twombly. The claws here have a freshness and immediacy that show great promise.

Figure 5A (legend)
Figure 5B

3. Light – Late on the last night of our residency after a hard day in the lab, we thought the crabs could use a little fun. We teamed up with Andy and Chris to create a final, light-based experiment. We temporarily attached colored LED lights to different crabs and allowed them free (more or less) to chart their own courses. First in a confined environment in the house (Fig. 6A) and later completely unbounded on the beach (Fig. 6B). Of course, this technique did not allow us to record the tracks of the crabs in any detail but it had several other advantages: 1) LED lights were more durable than paint; 2) it allowed us to study crabs in the dark and we were in a hurry; 3) it looked pretty damn cool!

We actually had 6 (maybe 7?) crabs in our initial trial and unfortunately LED lights could only be set to 3-4 different wavelengths. This meant that we had crabs with completely different shells wearing the same colour, which completely confounded our results and did not allow us to unequivocally associate specific crabs with their tracks, but to be honest we didn’t much care anymore.

Figure 6A
Figure 6B

(Photography by the indomitable Andy “Don’t” Quitmeyer)

Conclusions

In conclusion, based on our poorly-designed and shoddily-performed experiments we can firmly reject the null hypothesis (based on pure self-confidence): hermit crabs are not just simple arthropods made more relatable to the human eye by their mismatched shells. We argue that these crustaceans exhibit unique personalities and advanced artistic sensibilities, revealed only in part by their choice of shell and crawling behaviour.

Future directions. These experiments, as well as recent reports by Minsky et al. 2018, show that there is great under-appreciated art potential in hermit crabs, and arguably in crabs of all species. Indeed, in the following weeks, while exploring other tropical beaches we came across many interesting sand markings left by other kinds of crabs. Not only do crabs produce elegant tracks when they walk but most of them burrow during the day, producing further patterns of great interest. Here are only two examples: the Ghost Crab (Fig. 7A) besides looking extremely badass, also creates these comet-like shapes around their burrow (Fig. 7B). The elusive Sand Bubbler Crab (too small for us to take a good picture), builds delicate constellations of tiny sand balls (Fig. 8). Finally, take a look at these crazy snails which we met on our last day in Phuket going round and round in celtic-looking tracks (Fig. 9). This will no doubt provide inspiration for many years of amphibological studies.

Figure 7A
Figure 7B
Figure 8

     

Figure 9

Practical applications. Beyond their aesthetic value, there is considerable potential in crab-inspired designs and tools. As a proof of concept, our in-house designer studied the individual crab markings and processed these into a series of digital brushes (Fig. 10A) – available to download at this link -which she then used to compose a meandering, infinitely repeating pattern (Fig. 10B). Some fabric prints are currently in development and we welcome suggestions for further artistic and commercial applications.

Figure 10A
Figure 10B

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