For me, the quintessence of Spyderco shapes is the Caly 3. (Caly 3.5 also).
Closed or opened it is perfect, Contrary to the delica or endura for example, that have a gap between the back of the blade and the handle. They are very nice tools, as a ton of Spyderco knives, but there is something missing in the geometry of both closed knives.
| C10PGRE Endura 4 | C28GPFG Dragonfly | C36TIP Military | C41GP5 Native 5 | C54GPBN Calypso | C65CFP Lum Chinese | C90GFPD Strectch | C94TIP UK Penknife | C113GPGY Caly 3 | C122GPBL Tenacious | C123TIP Sage 2 | C126GPFG Rock Lobster | C135GP Perrin PPT | C136GPBL Persistence | C144CFPE Caly 3.5 | C163PBK Pingo | C164GPBN Nilakka || MT16P MT17P MT18P Mule Team |