Rack of Test Tubes

A descriptive term referring to the homogeneous architecture of optimal parallel orientation of normal colonic glands, fancifully likened to test tubes; loss of this homogeneity is typical of inflammatory bowel disease seen by light microscopy at low power
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But in the last few weeks I've had soup served in a rack of test tubes, goblets of vegetable "emulsion" on an artist's palette, cheese on a mini-skateboard and chips in a dustbin, like these on the right.
"In most cases, it's simply a matter of having more than one tube open at a time." The fastest way to fill a rack of test tubes is to line them up in a row, dispensing 5 mL into each tube.
It's hard to sympathise with characters who have all the colourless charm of a rack of test tubes.