A pocket calculator

Protected in a layer of bubble wrap you find an old style pocket calculator. Not even a modern one with an LCD screen and the ability to perform complex functions. It's a heavy slab of plastic with just a few number and function keys. Add, subtract, multiply and divide. Curious to see if it works you switch it on and the illuminated display flickered to life.

"Welcome new user" scrolled from right to left the letters forming one at a time "select function. Merge. Morph. Swap. Separate."

That doesn't make much sense to you so you tap a function key at random and watch the display change to...